The Miura family went on their first family trip together since her divorce from her husband. The trip was a gift from Kenji, the eldest son, to his mother, Eriko, and Eriko was delighted by her eldest son's unexpected filial piety. However, Kenji had been planning to carry out a plan during the trip... Kenji had always felt annoyed by the physical relationship between his mother and the second son, Osamu, and he had been plotting to use the trip as an opportunity to steal his mother away. As Kenji watched his second son cling to Eriko without any regard for the attention of others as usual, his Kokoro flared up intensely...